问题描述: 3/2-5/6+7/12-9/20+11/30-13/42=() 1个回答 分类:数学 2014-12-11 问题解答: 我来补答 3/2-5/6+7/12-9/20+11/30-13/42 =1+1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7) =1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7 =1-1/7 =6/7 展开全文阅读